package lad02.test20;
import java.util.Scanner;
public class Test20 {
    public static void main(String[] args) {
    Scanner B= new Scanner(System.in);
    System.out.println("请输入字符串:");
    String str = B.nextLine();
    char[] ch = str.toCharArray();   //将字符串转换成字符数组

    System.out.println("输出所有数字字符."); //对数组进行遍历，找出所有数字字符。
    for (int i = 0; i < ch.length; i++) {
        if (ch[i] >= '0' && ch[i] <= '9') {
            System.out.print(ch[i]);
        }
    }
}
}
